test: debug test fallback MHE

Author: franckgaga

test/test_state_estim.jl

@@ -988,19 +988,19 @@ end
     P̂arr_old_copy = deepcopy(mhe.P̂arr_old)
     invP̄_copy = deepcopy(mhe.invP̄)
     @test_logs(
-        (:error, "Arrival covariance is not positive definite: keeping the old one"), 
+        (:error, "Arrival covariance P̄ is not positive definite: keeping the old one"), 
         preparestate!(mhe, [50, 30], [5])
     )
     @test mhe.P̂arr_old ≈ P̂arr_old_copy
     @test mhe.invP̄ ≈ invP̄_copy
     @test_logs(
-        (:error, "Arrival covariance is not positive definite: keeping the old one"), 
+        (:error, "Arrival covariance P̄ is not positive definite: keeping the old one"), 
         updatestate!(mhe, [10, 50], [50, 30], [5])
     )
     @test mhe.P̂arr_old ≈ P̂arr_old_copy
     @test mhe.invP̄ ≈ invP̄_copy
     @test_logs(
-        (:error, "Arrival covariance is not invertible: keeping the old one"), 
+        (:error, "Arrival covariance P̄ is not invertible: keeping the old one"), 
         ModelPredictiveControl.invert_cov!(mhe, Hermitian(zeros(mhe.nx̂, mhe.nx̂),:L))
     )
 end